[PATCH] OMAP: Add Watchdog driver support

Add Texas Instruments (TI) OMAP1/2 (http://www.ti.com/omap) based
processors, like OMAP1610/1710/242x.

[akpm@osdl.org: cleanups]
Cc: <gdavis@mvista.com>
Cc: "Komal Shah" <komal_shah802003@yahoo.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

drivers/char/watchdog/Kconfig

@@ -165,6 +165,13 @@ config EP93XX_WATCHDOG
 	  To compile this driver as a module, choose M here: the
 	  module will be called ep93xx_wdt.
 
+config OMAP_WATCHDOG
+	tristate "OMAP Watchdog"
+	depends on WATCHDOG && (ARCH_OMAP16XX || ARCH_OMAP24XX)
+	help
+	  Support for TI OMAP1610/OMAP1710/OMAP2420 watchdog.  Say 'Y' here to
+	  enable the OMAP1610/OMAP1710 watchdog timer.
+
 # X86 (i386 + ia64 + x86_64) Architecture
 
 config ACQUIRE_WDT

drivers/char/watchdog/Makefile

@@ -24,6 +24,7 @@ obj-$(CONFIG_USBPCWATCHDOG) += pcwd_usb.o
 
 # ARM Architecture
 obj-$(CONFIG_AT91_WATCHDOG) += at91_wdt.o
+obj-$(CONFIG_OMAP_WATCHDOG) += omap_wdt.o
 obj-$(CONFIG_21285_WATCHDOG) += wdt285.o
 obj-$(CONFIG_977_WATCHDOG) += wdt977.o
 obj-$(CONFIG_IXP2000_WATCHDOG) += ixp2000_wdt.o

drivers/char/watchdog/omap_wdt.c

@@ -0,0 +1,391 @@
+/*
+ * linux/drivers/char/watchdog/omap_wdt.c
+ *
+ * Watchdog driver for the TI OMAP 16xx & 24xx 32KHz (non-secure) watchdog
+ *
+ * Author: MontaVista Software, Inc.
+ *	 <gdavis@mvista.com> or <source@mvista.com>
+ *
+ * 2003 (c) MontaVista Software, Inc. This file is licensed under the
+ * terms of the GNU General Public License version 2. This program is
+ * licensed "as is" without any warranty of any kind, whether express
+ * or implied.
+ *
+ * History:
+ *
+ * 20030527: George G. Davis <gdavis@mvista.com>
+ *	Initially based on linux-2.4.19-rmk7-pxa1/drivers/char/sa1100_wdt.c
+ *	(c) Copyright 2000 Oleg Drokin <green@crimea.edu>
+ *	Based on SoftDog driver by Alan Cox <alan@redhat.com>
+ *
+ * Copyright (c) 2004 Texas Instruments.
+ *	1. Modified to support OMAP1610 32-KHz watchdog timer
+ *	2. Ported to 2.6 kernel
+ *
+ * Copyright (c) 2005 David Brownell
+ *	Use the driver model and standard identifiers; handle bigger timeouts.
+ */
+
+#include <linux/module.h>
+#include <linux/config.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/miscdevice.h>
+#include <linux/watchdog.h>
+#include <linux/reboot.h>
+#include <linux/smp_lock.h>
+#include <linux/init.h>
+#include <linux/err.h>
+#include <linux/platform_device.h>
+#include <linux/moduleparam.h>
+#include <linux/clk.h>
+
+#include <asm/io.h>
+#include <asm/uaccess.h>
+#include <asm/hardware.h>
+#include <asm/bitops.h>
+
+#include <asm/arch/prcm.h>
+
+#include "omap_wdt.h"
+
+static unsigned timer_margin;
+module_param(timer_margin, uint, 0);
+MODULE_PARM_DESC(timer_margin, "initial watchdog timeout (in seconds)");
+
+static int omap_wdt_users;
+static struct clk *armwdt_ck = NULL;
+static struct clk *mpu_wdt_ick = NULL;
+static struct clk *mpu_wdt_fck = NULL;
+
+static unsigned int wdt_trgr_pattern = 0x1234;
+
+static void omap_wdt_ping(void)
+{
+	/* wait for posted write to complete */
+	while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
+		cpu_relax();
+	wdt_trgr_pattern = ~wdt_trgr_pattern;
+	omap_writel(wdt_trgr_pattern, (OMAP_WATCHDOG_TGR));
+	/* wait for posted write to complete */
+	while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x08)
+		cpu_relax();
+	/* reloaded WCRR from WLDR */
+}
+
+static void omap_wdt_enable(void)
+{
+	/* Sequence to enable the watchdog */
+	omap_writel(0xBBBB, OMAP_WATCHDOG_SPR);
+	while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
+		cpu_relax();
+	omap_writel(0x4444, OMAP_WATCHDOG_SPR);
+	while ((omap_readl(OMAP_WATCHDOG_WPS)) & 0x10)
+		cpu_relax();
+}
+
+static void omap_wdt_disable(void)
+{
+	/* sequence required to disable watchdog */
+	omap_writel(0xAAAA, OMAP_WATCHDOG_SPR);	/* TIMER_MODE */
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
+		cpu_relax();
+	omap_writel(0x5555, OMAP_WATCHDOG_SPR);	/* TIMER_MODE */
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x10)
+		cpu_relax();
+}
+
+static void omap_wdt_adjust_timeout(unsigned new_timeout)
+{
+	if (new_timeout < TIMER_MARGIN_MIN)
+		new_timeout = TIMER_MARGIN_DEFAULT;
+	if (new_timeout > TIMER_MARGIN_MAX)
+		new_timeout = TIMER_MARGIN_MAX;
+	timer_margin = new_timeout;
+}
+
+static void omap_wdt_set_timeout(void)
+{
+	u32 pre_margin = GET_WLDR_VAL(timer_margin);
+
+	/* just count up at 32 KHz */
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+		cpu_relax();
+	omap_writel(pre_margin, OMAP_WATCHDOG_LDR);
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x04)
+		cpu_relax();
+}
+
+/*
+ *	Allow only one task to hold it open
+ */
+
+static int omap_wdt_open(struct inode *inode, struct file *file)
+{
+	if (test_and_set_bit(1, (unsigned long *)&omap_wdt_users))
+		return -EBUSY;
+
+	if (cpu_is_omap16xx())
+		clk_enable(armwdt_ck);	/* Enable the clock */
+
+	if (cpu_is_omap24xx()) {
+		clk_enable(mpu_wdt_ick);    /* Enable the interface clock */
+		clk_enable(mpu_wdt_fck);    /* Enable the functional clock */
+	}
+
+	/* initialize prescaler */
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
+		cpu_relax();
+	omap_writel((1 << 5) | (PTV << 2), OMAP_WATCHDOG_CNTRL);
+	while (omap_readl(OMAP_WATCHDOG_WPS) & 0x01)
+		cpu_relax();
+
+	omap_wdt_set_timeout();
+	omap_wdt_enable();
+	return 0;
+}
+
+static int omap_wdt_release(struct inode *inode, struct file *file)
+{
+	/*
+	 *      Shut off the timer unless NOWAYOUT is defined.
+	 */
+#ifndef CONFIG_WATCHDOG_NOWAYOUT
+	omap_wdt_disable();
+
+	if (cpu_is_omap16xx()) {
+		clk_disable(armwdt_ck);	/* Disable the clock */
+		clk_put(armwdt_ck);
+		armwdt_ck = NULL;
+	}
+
+	if (cpu_is_omap24xx()) {
+		clk_disable(mpu_wdt_ick);	/* Disable the clock */
+		clk_disable(mpu_wdt_fck);	/* Disable the clock */
+		clk_put(mpu_wdt_ick);
+		clk_put(mpu_wdt_fck);
+		mpu_wdt_ick = NULL;
+		mpu_wdt_fck = NULL;
+	}
+#else
+	printk(KERN_CRIT "omap_wdt: Unexpected close, not stopping!\n");
+#endif
+	omap_wdt_users = 0;
+	return 0;
+}
+
+static ssize_t
+omap_wdt_write(struct file *file, const char __user *data,
+		size_t len, loff_t *ppos)
+{
+	/* Refresh LOAD_TIME. */
+	if (len)
+		omap_wdt_ping();
+	return len;
+}
+
+static int
+omap_wdt_ioctl(struct inode *inode, struct file *file,
+	unsigned int cmd, unsigned long arg)
+{
+	int new_margin;
+	static struct watchdog_info ident = {
+		.identity = "OMAP Watchdog",
+		.options = WDIOF_SETTIMEOUT,
+		.firmware_version = 0,
+	};
+
+	switch (cmd) {
+	default:
+		return -ENOIOCTLCMD;
+	case WDIOC_GETSUPPORT:
+		return copy_to_user((struct watchdog_info __user *)arg, &ident,
+				sizeof(ident));
+	case WDIOC_GETSTATUS:
+		return put_user(0, (int __user *)arg);
+	case WDIOC_GETBOOTSTATUS:
+		if (cpu_is_omap16xx())
+			return put_user(omap_readw(ARM_SYSST),
+					(int __user *)arg);
+		if (cpu_is_omap24xx())
+			return put_user(omap_prcm_get_reset_sources(),
+					(int __user *)arg);
+	case WDIOC_KEEPALIVE:
+		omap_wdt_ping();
+		return 0;
+	case WDIOC_SETTIMEOUT:
+		if (get_user(new_margin, (int __user *)arg))
+			return -EFAULT;
+		omap_wdt_adjust_timeout(new_margin);
+
+		omap_wdt_disable();
+		omap_wdt_set_timeout();
+		omap_wdt_enable();
+
+		omap_wdt_ping();
+		/* Fall */
+	case WDIOC_GETTIMEOUT:
+		return put_user(timer_margin, (int __user *)arg);
+	}
+}
+
+static struct file_operations omap_wdt_fops = {
+	.owner = THIS_MODULE,
+	.write = omap_wdt_write,
+	.ioctl = omap_wdt_ioctl,
+	.open = omap_wdt_open,
+	.release = omap_wdt_release,
+};
+
+static struct miscdevice omap_wdt_miscdev = {
+	.minor = WATCHDOG_MINOR,
+	.name = "watchdog",
+	.fops = &omap_wdt_fops
+};
+
+static int __init omap_wdt_probe(struct platform_device *pdev)
+{
+	struct resource *res, *mem;
+	int ret;
+
+	/* reserve static register mappings */
+	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+	if (!res)
+		return -ENOENT;
+
+	mem = request_mem_region(res->start, res->end - res->start + 1,
+				 pdev->name);
+	if (mem == NULL)
+		return -EBUSY;
+
+	platform_set_drvdata(pdev, mem);
+
+	omap_wdt_users = 0;
+
+	if (cpu_is_omap16xx()) {
+		armwdt_ck = clk_get(&pdev->dev, "armwdt_ck");
+		if (IS_ERR(armwdt_ck)) {
+			ret = PTR_ERR(armwdt_ck);
+			armwdt_ck = NULL;
+			goto fail;
+		}
+	}
+
+	if (cpu_is_omap24xx()) {
+		mpu_wdt_ick = clk_get(&pdev->dev, "mpu_wdt_ick");
+		if (IS_ERR(mpu_wdt_ick)) {
+			ret = PTR_ERR(mpu_wdt_ick);
+			mpu_wdt_ick = NULL;
+			goto fail;
+		}
+		mpu_wdt_fck = clk_get(&pdev->dev, "mpu_wdt_fck");
+		if (IS_ERR(mpu_wdt_fck)) {
+			ret = PTR_ERR(mpu_wdt_fck);
+			mpu_wdt_fck = NULL;
+			goto fail;
+		}
+	}
+
+	omap_wdt_disable();
+	omap_wdt_adjust_timeout(timer_margin);
+
+	omap_wdt_miscdev.dev = &pdev->dev;
+	ret = misc_register(&omap_wdt_miscdev);
+	if (ret)
+		goto fail;
+
+	pr_info("OMAP Watchdog Timer: initial timeout %d sec\n", timer_margin);
+
+	/* autogate OCP interface clock */
+	omap_writel(0x01, OMAP_WATCHDOG_SYS_CONFIG);
+	return 0;
+
+fail:
+	if (armwdt_ck)
+		clk_put(armwdt_ck);
+	if (mpu_wdt_ick)
+		clk_put(mpu_wdt_ick);
+	if (mpu_wdt_fck)
+		clk_put(mpu_wdt_fck);
+	release_resource(mem);
+	return ret;
+}
+
+static void omap_wdt_shutdown(struct platform_device *pdev)
+{
+	omap_wdt_disable();
+}
+
+static int omap_wdt_remove(struct platform_device *pdev)
+{
+	struct resource *mem = platform_get_drvdata(pdev);
+	misc_deregister(&omap_wdt_miscdev);
+	release_resource(mem);
+	if (armwdt_ck)
+		clk_put(armwdt_ck);
+	if (mpu_wdt_ick)
+		clk_put(mpu_wdt_ick);
+	if (mpu_wdt_fck)
+		clk_put(mpu_wdt_fck);
+	return 0;
+}
+
+#ifdef	CONFIG_PM
+
+/* REVISIT ... not clear this is the best way to handle system suspend; and
+ * it's very inappropriate for selective device suspend (e.g. suspending this
+ * through sysfs rather than by stopping the watchdog daemon).  Also, this
+ * may not play well enough with NOWAYOUT...
+ */
+
+static int omap_wdt_suspend(struct platform_device *pdev, pm_message_t state)
+{
+	if (omap_wdt_users)
+		omap_wdt_disable();
+	return 0;
+}
+
+static int omap_wdt_resume(struct platform_device *pdev)
+{
+	if (omap_wdt_users) {
+		omap_wdt_enable();
+		omap_wdt_ping();
+	}
+	return 0;
+}
+
+#else
+#define	omap_wdt_suspend	NULL
+#define	omap_wdt_resume		NULL
+#endif
+
+static struct platform_driver omap_wdt_driver = {
+	.probe		= omap_wdt_probe,
+	.remove		= omap_wdt_remove,
+	.shutdown	= omap_wdt_shutdown,
+	.suspend	= omap_wdt_suspend,
+	.resume		= omap_wdt_resume,
+	.driver		= {
+		.owner	= THIS_MODULE,
+		.name	= "omap_wdt",
+	},
+};
+
+static int __init omap_wdt_init(void)
+{
+	return platform_driver_register(&omap_wdt_driver);
+}
+
+static void __exit omap_wdt_exit(void)
+{
+	platform_driver_unregister(&omap_wdt_driver);
+}
+
+module_init(omap_wdt_init);
+module_exit(omap_wdt_exit);
+
+MODULE_AUTHOR("George G. Davis");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);

drivers/char/watchdog/omap_wdt.h

@@ -0,0 +1,64 @@
+/*
+ *  linux/drivers/char/watchdog/omap_wdt.h
+ *
+ *  BRIEF MODULE DESCRIPTION
+ *      OMAP Watchdog timer register definitions
+ *
+ *  Copyright (C) 2004 Texas Instruments.
+ *
+ *  This program is free software; you can redistribute  it and/or modify it
+ *  under  the terms of  the GNU General  Public License as published by the
+ *  Free Software Foundation;  either version 2 of the  License, or (at your
+ *  option) any later version.
+ *
+ *  THIS  SOFTWARE  IS PROVIDED   ``AS  IS'' AND   ANY  EXPRESS OR IMPLIED
+ *  WARRANTIES,   INCLUDING, BUT NOT  LIMITED  TO, THE IMPLIED WARRANTIES OF
+ *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
+ *  NO  EVENT  SHALL   THE AUTHOR  BE    LIABLE FOR ANY   DIRECT, INDIRECT,
+ *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ *  NOT LIMITED   TO, PROCUREMENT OF  SUBSTITUTE GOODS  OR SERVICES; LOSS OF
+ *  USE, DATA,  OR PROFITS; OR  BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ *  ANY THEORY OF LIABILITY, WHETHER IN  CONTRACT, STRICT LIABILITY, OR TORT
+ *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ *  You should have received a copy of the  GNU General Public License along
+ *  with this program; if not, write  to the Free Software Foundation, Inc.,
+ *  675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+
+#ifndef _OMAP_WATCHDOG_H
+#define _OMAP_WATCHDOG_H
+
+#define OMAP1610_WATCHDOG_BASE		0xfffeb000
+#define OMAP2420_WATCHDOG_BASE		0x48022000	/*WDT Timer 2 */
+
+#ifdef CONFIG_ARCH_OMAP24XX
+#define OMAP_WATCHDOG_BASE 		OMAP2420_WATCHDOG_BASE
+#else
+#define OMAP_WATCHDOG_BASE 		OMAP1610_WATCHDOG_BASE
+#define RM_RSTST_WKUP			0
+#endif
+
+#define OMAP_WATCHDOG_REV		(OMAP_WATCHDOG_BASE + 0x00)
+#define OMAP_WATCHDOG_SYS_CONFIG	(OMAP_WATCHDOG_BASE + 0x10)
+#define OMAP_WATCHDOG_STATUS		(OMAP_WATCHDOG_BASE + 0x14)
+#define OMAP_WATCHDOG_CNTRL		(OMAP_WATCHDOG_BASE + 0x24)
+#define OMAP_WATCHDOG_CRR		(OMAP_WATCHDOG_BASE + 0x28)
+#define OMAP_WATCHDOG_LDR		(OMAP_WATCHDOG_BASE + 0x2c)
+#define OMAP_WATCHDOG_TGR		(OMAP_WATCHDOG_BASE + 0x30)
+#define OMAP_WATCHDOG_WPS		(OMAP_WATCHDOG_BASE + 0x34)
+#define OMAP_WATCHDOG_SPR		(OMAP_WATCHDOG_BASE + 0x48)
+
+/* Using the prescaler, the OMAP watchdog could go for many
+ * months before firing.  These limits work without scaling,
+ * with the 60 second default assumed by most tools and docs.
+ */
+#define TIMER_MARGIN_MAX    	(24 * 60 * 60)	/* 1 day */
+#define TIMER_MARGIN_DEFAULT	60	/* 60 secs */
+#define TIMER_MARGIN_MIN	1
+
+#define PTV			0	/* prescale */
+#define GET_WLDR_VAL(secs)	(0xffffffff - ((secs) * (32768/(1<<PTV))) + 1)
+
+#endif				/* _OMAP_WATCHDOG_H */